Update jTextField in another swing gui class

My problem is to update jTextField1 (update province) in class Province.java.
The first GUI showing up is AddAddress which contains 4 fields ( jTextField ) to be filled in : province ( jTextField1), district(2), ward(3) . Each time double-click on jTextField1 or 2 or 3 or 4 a new JFrame appears showing province, district or ward list. After clicking, it returns back to the first GUI and the province/district/ward clicked is updated.